Circuit changer



April 20 1926. 1,581,603

" s. s. STOLP CIRCUI T CHANGER .Filed Sept. 1, 1922 atented Apr. 20, 1926.

ornren smrns SAMEL s. STOLE, on MANFELD; 'onro, nss;onon T0 TEE 0H10 BRASS COMPANY.L

PATENT on MANSFIELD, OIIQ, A conromrrron on nnw mnsny.

BCUT CHANGER.

Application filed September /'0 all 107mm may ooncem: ie it known that i, AIIUEL STOLP, a citizen of the United States and resident of Mansfield, count:. oi ltichland and Stte 0f Ohio, have inventcd certain new and useful ln1provements in Circuit xll1angers 0i' WhiCli (ho tcllowing is specificntion, and whicl: arc illustrated in the accompanying drawing s, forming a part thereof.

The invention relates to an improved cir cuit changer used in conjunction with a solenoicl, the latter being employed,tor example, for antomatic operation of an elcctric rail wa v switcl1. When used for this purpose, and in tire preferrod crin herein selccted for illustration, the invention contemplates the provision of a eontactor or pan on the trol ley \\'ire or tl1e like in advance of the switch, 2. double socnoid actuatlng tl1e switch, a constantly closed circuit of relatively liigh resistancc connccting tne solenoid windings with the trolley uire, and acircuit changer opcrable to selectively direct current at liigli amperane into the diilerent solenoid Wincf'or a predeterlnined but definitely limited iutcrval o:t time, in accorclance witlr the cntrance ot thc trolley into the pan with power on or power off, the said operation l:ei11g; ind%pendent of tlie duration of the contact of the trolley with the pan or cl1annes in the condition o1:' tlre power'circuit of the car during the period of contact. As heretotore constructed electric switclx operatinp; devices have regnired contact ot tlrc trolley xvl1eel with the pantor an apprecinble tin1e period in order tlmt con1plete saturation ot' tlae solenoid shonld coeur. 'lhis tintne period has oeen secured loy nmking the parts of considerable i'ength and l) v limiting the speed of the car in passing tl1e pan. The limitation oi" speed of the car introduces tl1e personnl cquati m et the motorman and to lllRt extnt such a construction is not anto1natie. lt isg tl1erelore one of tlie ob ects of the invention to pro-vide a circuit changer; which, Wl1en set in operation upon contact of the trolley nheel nith tl1e pan,'ineures the application of current t0 tlxe sole noid for 2l. sutlicient lenglth 01" tinie to ol3tnin ,its complte satruntimi witliont continuing the application long enough to injure t-l1e s0lenoid under any circimistances. To this end the invention providcs an assembly of apporatus cmnprisin :Lplnrality -ot parts, operating in succession following an instan- -corc 17 to more inu'2zrdly.

1, 1922. Serial No. 585,689.

tzmeous contact O the trolley Wheel with the pan, the opemtion of each part contributing a definite time elenaent to the period cluring which the solenoid is energized. tt isalso to be noted that in the preferred formol. the

invention, as illustrated, the constant appli lhe ovcrhead trolley wireis shown at 10 and a trolley polo at 11, the henting, lighting and motive powcr circuits of a. car being de 'gnated, 12, 18 and 14, respeCtively. "A movable switcl1 point 15 is Prelerably di rectly connected as means of a link 16, t0

the stem 1 of the core 17 of an adjacent double solenoid 18, the position and inovement of the switch point 15 being governed by the position and m0vernent of the soid solenoid COI'G. is shown in the diagmn; switc'h point 15 is set to direct the a=pprbach ing car onto the siding l9. t i0llons tln1t it the car is to continue to travel on the main line, as 20,n change mustbe produced in tl;e ene zation ol solenoid 18 t0 couse witl1 tl3e usual practieo tne energizzitioh ct tlie solenoid 18 is controll in'the tiret in stance l3 tlic contact ol trolley ivhe'el 21 of the amnoachinc car with a trolley contactor r pan 1: laced et e. convenieut distance in front of the switcl1, the condition of' the power circuit os ll. or thecar determining \\lllCll ot the two Windings, as l8, -l9, ci tl1e solenoid 18 enerrized.

In case it is de 'red to prevent a following car Jro1n cm.1smg a second ope1ation ol tire svritch hefore tire tiret car has treveled a certain distance beyond, a second pan 23 may lie provided. As the trolley 10 is (livided at the switch, it is understood' that a pan 23 Wlll be mounted open ench branch of tli trolle; beyond the. sivitch, but for simplicily ou? illustration tl1e branching of the In accordance Cil relay B, as through wire 47.

trolley wireis omitted frein the diagram and only one pan 23 is shown. In the event it is desired to omit pan 23, the .switch indi- 'cated at 24 should be opened. .This is the only change required in event pan 23 is not used. V

Pan 22 preferably includcs a pair of side bars 27 and 28. These side bars are insulated from each other and one of them, as 28, is normally insulated from trolley wire 10. The other side bar, as 27, is connected with the trolley wire 10 at all cimes, as

28 and a path for current from side bar 27 to ground. This pat-h for current to ground is through trolley pole 11 and the various circuits, as 12, 13, 14 of the car, theamount of current drawn through the main w1nd1ng 31 of the circuit changrng relay A, when trolley Wheel 21 contacts With the pan,

being principally determined by the conditin of the power circuit 14 of the car.

The bridging of side bars 27 and 28 of the pan by trolley wheel 21 completes a circuit connecting winding 33 of relay B with trolley wire 10. Relay B is accordingly energized regardless of Whether power is on or off. The circuit through relay B includes wires 29 and 30, main winding 31 of relay A, wire 32, side bar 27, trolley wheel 21, side bar 28, and wires 35' and 36. Vinding 33 of relay B is of relatively high resistance, preferably approximately 500ohms when a 600 volt circuit is used. Vinding 33 is v grounded through wire 38, a relative1y high limiting resistance 39 and wire 40.

An 1mportant feature of the invention 15 the provision of two front contacts 41 and 42 for the armature 43 of relay B. In its lifted position, armature 43 is direct1y con nected with trolley wire 10, through Wire 29, wire 44, fuse 45, wire 46 and front contact 42. So long as trolley wheel 21 remains in contact with the pan 22 armature 43 also has a connection With trolley wire through front contact 41, this connection comprising wvires 29, 30, winding 31, wire 32, the two side bars 27, 28 of the pan and wires 35, 36 and 37.

The armature 34 of circuit el1anging relay A is directly connected With armature 43 of Armature is accordingly connected with trolley wire 10 when armature 43 is in its lifted postion. It follows that armature 34 is always connected with trolley wire 10 upon the entrance of trolley wheel 21 into the pan. If power is off, armature 34 rema ins in its lOW- eredposition. Under'these circumstance&s winding 49 of solenoid 18 is energized, the path for current being from trolley wire 10 throgh armature 34, back contact 50, and

Wires 51 and 56.

VVheel 21 in pan 22, with powcr on, connects armature 34 With trolley Wire 10 in the same manner as with power off, but causes Suffioient energization of relay A to lift 4 armature 34. Current is accordingly directed into solenoidwindng 48 through frontc0ntact 53, the path for current being noW through a second windng 54 on relay A andwires 55 and '52. The purpose of winding 54 on relay A is to hold armature 34 in its lifted position in event trolley Wheel 21 leaves the pan 22 before the time provided for saturation of solenoid Winding 49,'as determined by other parts of the apparatus, has elapsed. Since encrgization of windng 48 moves switch point to the position shown in the diagram and energi zation of windng 49 throws the switch to open the main lino, itfol1ows that the car should coast into the pan if it is to continue on the main line and should enter the pan with power on if it is to take the siding.

Another important feature of the inven tienis the provision of a: ielay C, having a winding 57', Which is normally enorgized. As shown, relay 57 has two windings 57 and 71, its main winding 57 being connected with trolley wire 10 through wires 29 and 58. In the particular arrangement illustrated the current norn1ally supplied to the main winding 57 of relay C is divided and supplied in equal amouncs to the two windings 48 and 49 of solenoid 18. The current thus constantly supplied to Windings 48 and 49 is of lOW amperage, but raises the temperacure of the solenoid sufiiciently to pre' vent snow and ice from accu1nulatng on the solen0id casing and serves to keep the windings dry. \Vhen the solcin0id core 17 is relatively short, as shown, the continuons flow of current into the solenoid windings also creates a corresponding flux dilerential in the two ends of the solenoid in accordance with the position of the core. This flux diferential has a buoyan't effect on core 17 Permitting it to move easily. This flux diffeiential also serves to lock the switch electrical1y in either position rendering the use Of knuokles, springs or other mcchanical holding devices unnecessary. lit furthcr acts as a dynamic brake to prevent too rapid movemcnt'and a possible rebound of the switch point 15. It will be understood that the locking of the switch in its difierent positions arises from the fact that WllllQ there is a continuous fiow of current in botn of the.windings 48 and 49 of the solenoid, the winding at the end of the solenoid in Which the core is located is most ellecve. upon it.

Since Winding 57 is normal1y energlzed l y its connection with trolley wire 10, armature (3:3 is norma'lly held in eleVaced posi tion, as shownq W'hen trolley wheel- 21 euters pan 22, file-11121111 winding 57 01 relay C is shunted out through wires 35 and 59, its ar11mture (32;, falling by gravity, preferably upon two back contacts 641 and lrhen switch 241 is closed the shunting out of the main winding 57 ct relay 0 is continued by the closing ot back contactfl4: regardless of whether current is supplied t0 wire 35 from the pan 22 or not, wire 35 being now dirrtly connected to trolley wire 10 throuah armature 63, baok contact 64, wire 78 suitcn 2 1 and wire 29. It follows that armature'63 of relay C remains down until it is lifted by engagement et the trolley wheel 21 With pan 28 in the manner hereinalter explained.

in the arrangement shown, the release of armature 63 et relay 0 is retaided in two ways, each contributmg a separate time factor in the energization 01 the traok solenoid, nc method o rctardna the release of armature 63 consists in shunting out.

indinp; ,57, as described, as distingushed trom opening the circuit through thisrelay. n addition, winding 57 is preferably also iorn1ed witlx a coppcr sleeve 67 on its core 66 to retard the release 01 the armature in a well known mnner. Furthermcre, 'back contacts 64: and 65 may be so located as to require armature 63 to fall through an appreciablc distance before engaging these contacts, thus contributing a third time factor' in the energizaci0n of the track solenoid. 7

When armature 63 drops ont0 back con tact 65, windirig 33 is shunted out by cur rent through wires 68 and 35. 'lhe shunting ont ct relay 38 furnishes a fourth 'time' factor and the retarded release of armature due to a cop per sleeve 69 mounted on core turnishes the fi:ftl1 and final time factor in the energization Of the solenoid windings. Armature 41-3 in dropping breaks the circuit through armature 34 to the solenoid 181 There is accordingly no further application of current to either of the windings 48 and 49 otsolenoid 18, except the small amount constantly furnished through resistances 60 and 61 regardless of whether trolley wheel 21 l1as loft the,pan 22 or not. l+urtl1ermcre, there can ce no further application ot curre11t to either of the windings ct solenoid 18 until armature 63 015 relay C l1aS been lifted and when switch 24 is closed tl1is does not occur until trolley wheel 21 engagea pan 23. thon energized by current fromtrolley w1re 10 through wire 72, side bar 73, trolley wheel 21, side bar 74 and wire 75, winding 71 of relay C bemggrouilded through w1re 76. To aro1d 1n ury t0 wmdmg 71 of rela Vinding 71 ofrelay C is of time with its trolley Wheel 21 in engage.

ment With pan 23, this winding is preferably made-ot high insistance; as niuch as 12,000 ohms being desirably used in a 600 volt circuit.

Should the second pan 23 be omitted, nire 75, the second \:lnding 71 on 1elay C, and the back contact 64 et this relay become unnecessary and switch 2 1- should be oPened. Armature 63 of relay C is then lifted as soon as the trolley wl1cel 21 leaves the pan 22,' ez ;cept that if the movementot the trolley heel through' the pan occupies less timethan tl1e picl; up and release of armature 18, armature 63 of relay C Wlll. not be lilted until alter the release of armature 13 has occurred, the shuhting out of winding 57 being continued Whi1e armature 413 of relay B is litted by a shunt path for current inCluding wires 51 and 56 or 55 and depending upon the position of armature 3% of relay A. A

The operation of the devicein the form A small amount of shoWn is as follows. current is constantly supplied to each 01 the windings 48 and 49 of the track sole noid 18. This solenoid is accordingly kept warm and dry at all times and the movable switch point 15 is held locked in the position to Wluch it was last moved by the current required for the heating and lighting circuits 12, 13, beiug insutficient to lift armature 34:. It tollows that it the car s coa sting armature 341 'Will romain in its lowered position while it the car is proceeding undcr power armature 34 Will be lifted to close front'contaet 53 Engagement of the trolley wheel 21 With the pan 22 serves also to lift armature 13 01 relay B and release armature 63 ofrelay C. lVhen armature 43 is lifted, power is supplied direct from the trolley wire 10 to one or theother 01 the windings 48, 41-9, o:t the tracks01eno1d 18, dependmg upon the position ot armature 34: et relay A. However,

engagement 01 the armature 63 with its back contact 65 serves t0 shunt out relay B. 111- terruption of the supply of current to the appropriate winding 418, 419; of the'traclfl solenoid 18 accordingly :tol lows automatiea1ly, th e length ot 'tllheduxlng which solenoid 18 is energized bel-na equal to the sum 0f five time intervals as fol1ows; First, the time required for shunting out relay 57; second, thetime required for release et armature 63 owing to the provision of a copper siceve 67 on the core 66 o' relay C; third, the time required for armature 63 to reach its back contact fourth, the time required for shunting ont winding 38, and fifth, the time required for release Of armature 43 owzing to the provision of a copper slceve 69 on the core of relay B.

ong as armature 68 remains upon its back contact 65 winding 33 is shunted out and there can be no second operation of the switch. When a second pan 28 is used and pan 22 until it rcaches pan 23. in

, cac no second pan, as 22-3, is'provided and noid, a main circuit including a circuit 'changer connecting the soino1d t0 a source switch 2% .is opcned, or this switch and its connections omittcd, winding 57 is shunted out and there can be no second operation of the switch whiicthe trolley whecl 21is en gagcd with pan 22, and until armature 43 ot reiay B is released.

The eature oi' supp1ying power to the track soienoid 18 directiy from the 'troiiey wire 10, as distinguished from the pan 22 where it Wouid be ad icd to tire amount drawn through winding 31by Lhe hcating, lighting and powcr circuits 12, 13 14, of the car, is not ciaimed broadiy'herern for the reason that such broad claims are made in my pending appiication or patent on circuit changers, Serial No.- 493,258 fiied August 18, 1921.

1t will be understood that the current constantiy suppiied to rclay C through wires 29 and 58 is divided between the two windings 18 and 49 of the track soienoid 18 by passing through wire and thcnce through scparate paths comprrsrng res1stancc 61 and wire 52, and resistance 60 and wire 56, respectively. Furthermore, windingS 48 and 49 of track sienoid 1S-both have a connection, to groundthrough wire 77. Since a sruall amount of current is passing through coiis 60 and 61 at aii timcs, these coi1s may aiso be used as heater coiis, and if they arecnclosed within the same, case with track soicnoid 18 they Wiii assist in keeping the interior of the case warm and dry.

The resistance of Winding 57 is such that the normal fion of current through' it Wiii not be sufiicient to permit energizing the winding 33 of relay B When the system is in normal condition, that is, when reiays r B and C are in thc condition shown in the drawing. 7 r

I ciaim as my invention: 7

1. In combination, a double wound soleo powr forselective temporary energization of the dificrentwindings of the solenoid in accordance with predetermined conditions and a second circuit of relativeiy high resistance constantiy connecting both Windings of the solenoid with the same source 0 power.

2. In combination,- a double wound soienoid, a main circuit inciuding a circuit changer connecting the solenoid to a source of power ior selective tcmporary encrgization of tire diierent windings of' thc so1e noid in accordance with predetcrmined conditions and a second circuit of rclatively high resistance connccting both windings of the soienoid with the San1e source of power 1 A ata1i other times. sw1tch 2st 1s ciosed, wmdmg 5( is shunted I ou rom the tune the troiiey*wheel 21 911-* In an eiectric switch opcrating device, in combination, a double wound soienoid and its core, one of said parts being movab1e,

movabie switch eiement, operative connection between the movaoie switch eicment and the movabie one of the two rst mentioned parts, a main circuit including a circuit changer connecting the soienoidto a source of power for selective temporary energization 01' the difl'ercnt windings of the solenoid upon the approach oi a car with power on or power o1i, and a second circuit of reia trveiy high resrstance constantiy connecting 'both Windings oi thcSolenoid with the same source of power.

4 in an electric switch operating devicc, in combination, a double wound solenoid and its core,. on c oisaid parts being movable, a movabie switch element, operative connection botween the movabie switch element and the movable one of the two first mentioried parts, a main circuit including a circuit changer connecting the soicnoid t0 a source of powcr for seiective temporary energization of the diierent Windings of the soie noid upon the am3roach of a car with power on or power oi, and a second circuit of relativeiy high resistance connecting both Windirigs of the soienoid with the saine source of powcr at ail other times.

5. In combination, a double wound soienoid and its core, the said two parts being relatiVely movabie betwcen two difi'erent positions and the solenoid and ocre being constructed for diiciEIit cflccts of the two WindiiigS of the so'icnoid upon the core in the said two positions, a main circuit inciuding a circuit changer connecting the solenoid to a source 01 power ior seiective temporary energization of the diflerent windir o tire soienoid in accordancewith predetermined conditions, and a second circuit o:f relativeiy high rcsistancc coustantiy connecting both windi1igs -of the soienoid With the same source of power. r 6. In con'ibination, a double wound solenoid and its core, the said two parts being relativly movabie bctwcen wo difi'erent positions and the soienoid and core hcing constructcd for difl'ercnt efl'ects of the two windings of the-soienord upon the core in the saidtwo positions, a main circuit inciuding a circuit changer connecting the solenoid ings of the solenoid upon the core in the said* tWo positions, a movable switch element, 0perative connection between the inovablc switch ele1nent and the movable one of the two 1irst mentioned parts, a main circuit in cluding a circuit changer connecting the solenoid t0 a source of power for s'elective temporary energization or the difierent windings of thesolenoid upon the appro:ich of a car with power on or power ofi and a second circuit constantly connecting both windings o.r' the solenoid With the same source of power.

8. In an electric switch operating device, in combination, a double Wound solenoid and its core, the said tWo parts being rela- 'tively movable between two diierent positions and the solenoid and ocre being constructed for diflerent effects of the two Wi11dings of the solenoid upon the core in the said two positions, a movable switch elemex1t, operative connection between the movable switch element and the movalole one of the two fii*st mentioned parts, a main circuit including a circuit changer conneoting the solenoid to a source of power for selective temporary energization of the difl'erent windings of the solenoid upon the approaChof a car With power on or power ofi, and second circuit connecting both windings of the solenoid With the same source Ofpower at all other times.

9. in combination, a double wound sole noid a main circuit including a circuit changer connecting the solenoid t0 a source of power for selective temporary power ful cnergizatimi of the different windings of the solenoid in accordance with predetermined conditions and a second circuit of relatively liigli resistance connecting the solenoid with the same source ot power for 'continued :Eeeble energization 0:" one o:f its windings after poweriul energization of the same winding through the said main circuit.

10. In an electric switch operating device, in combination, a double wond solenoid and its core, one of said parts being 1novable, a movable switch element, operative connection between the movable switch element and the movable one of the two first mentioned parts, a main circuit including a circuit changer connecting the solenoid to a source of power for selectii e tempo rary powertul energization of the different windings O the solenoid upon the approach of a car with power on or power off and a Second circuit of relatively high resist ance connecting the solenoid with the same source of power for continued feeble-en ergisation roi one of its windings after powerful energizationof the same winding tlirough the said main circuit whereby the said movable switch element is electro-magneticall locked in position aiter movement in one direction.

11. in combination, a double Wound sole noicL a main circuit including a circuit changer connecting the solenoid to a source' of power for selective temporary powerfnl energization of the difi'erent winding of the solenoid in accordance with-predeternined conditions and a second circuit of relatively high resistancca connecting thegsolenoid With the Saine source 'of power for continued ieeble ener9gizzttion of each of its windings immediatcly following powerful energization 0]. the sarne windi1ig through thesaid main circuit.

12. In an electric'switch opeirating device, in combinatiom a double wound solenoid and its ocre, one 0]: said parts being movable, a 1novable switch ele1nent, operative connection between the movable switch elemnt and the movable o-ne of the two first mentioned :parts, a main circuit including a circuit changer connecting the solenoid t0 a source of power for selective temporary power1ul energization .of the difierent windings of the solenoid upon the approach of a car with power on or power off and a second circuit 'of relatively lll,gl]. riesistance connecting the solenoid with the same source ofpower for continued ieebl energiztion of each of its windings immediately folloWi11g powerrl en-ergization of the same Winding through the said main circuit whereby the said n1ov able switch elernent is electi*omanetically locked in position after each opcration thereof.

13. In combination, a plural wound sole noid and its ocre, the said two parts being reletively movable between diflerent positions and the solenoid and ocre being con structd for eflects of the several windings of the solenoid upon the core' difl'ering in magnitude for the same current in the, dif fe1ent positions of the parts, means constantly furnisliing equal holding currents in all of the solenoid 'windings and means selectively f1urnishing a temporary operating current in the different solenoid windings.

.14. In combination, a plural wound solenoid, means selectively supplyin,z a temporar; operatii1g current in the diferent windingzs of the solenoid and 1neans furnishing a continued holding current in one of the solenoid Windings immediately following the,

temporary supply of an lo the saine winding. V

15. En combinution. u: l(l1l wound solo noid, menus seleccively supplying a temporury operzting currcnt in the difi'erent wind-- ings'of ll1e solenoid and menus frirnishin a oimting c urrent 'continued holding 'currcnt in ench of the solenid windinpgs immcidiulely following the -temporury supply ofan operatinp; current ing equal holding currents in all of the solenoid windings and means selectively furnishing a temporary opemting current in the diferent solenoid windings;

17. In an electric switch operating devicc, in combination, a plural wound solenoid and its COTE, 0110 01 said parts being movable, a movable railway switch element opcrtively connected to l1e movable one of l'he tWo first mentioned ports, menus selectively supply in;r a temporury ope1nting current in the difi'erent windings of the solenoid and meuns furnishing a continued holding; current in one 0:f' l:he solenoid windings immediately 0ll0sllfi' the lemporury supply of an operzuing Current to the same:winding whereby ilie said sWil1 element is clectromagnet icelly locked affer movement to one 0]: ils positions.- 1

1-8. In an electric switch operatinp; derice, in cong1bination, a plural wound solenoid and its cOrc,oneof;suid parts being.;movable, a 1norablc railway switclrelement operatively connectcd to the movable one of the two first mcniioncd parts, meens selectively supply ingj temporary operating onrrent intho differcnt windings 01. the soleuoid and inenns furnisl1ing continucd holding current in each h solenoid windings immediately following the temporury supply of an opernting c1.=rrent to the soma winding Wh reby llH: said switch elcn1enl. is electro-magneb icallyl1eld against moremcnt ulcer each opei'ation thereof.

19. In an electric switch operating device, the combinat-ion ol u movnble switch clemenl, electro-xnagnetio-1neuns foi mcving the switch elexncnL a power' lime a currcnt collector, a contactor for cooperation with the cu*rent collecter to cause tl1e operationhf s2iid means,nhd electro-magneti; means. for holding-fine svitch element aga inst morement af.ter operation thereofi 20. In an elect1ie switch operating devic, tl1e combumon of a 1novable su 1ch clement, means for 1noving ivho swicli elemenl j including a solenoid, a power lime, et contactor, a current collector l'or co peratiug with the contactor t0 supply a temporal-y operoting curreht to the solenoid and moans foi supplying a holding current to thes0lenoid.

In anelectric switch operating device, une. combination of a relatively movable solenoid and its core, a switch clament opercti vely connected to the movable one of the firsl; mentiomd parts, a low resistzmce circuit including the soleno'id, a, power lino, L contactor, 2L curlent collectorfor cooperatinQ* with the contactor to temporarily close the low resistance circuit with tire power lino.

and a high 1esistance circuit connecting tl1o soleno1d Wilh the power line.

22. In combmat10n, a double wound solenoid, nieans selctively supplying an opemt ing current to the (ilifl'erent Windings of the s0lcn01d and menus constantly supplymg current at relatively low amperage to both of the solenoid windings.

23. In an electric switch operating device, the combination of a relatively movable double Wound solenoid and its core, a movablo switch element operatively connected to the morable one of the two firsbmcnti med ports,

the combinaticn a -power lino, a contac- 'tor, a track soleno1d, a normally open C11- cuit of low resistunce connecting the power line.with the truck solenoid, a current collector adzmptedto cooperate With the contactor to temporarily close said circuit, 3 sec 0nd high resiscance circuit connecting the tracksolenoid with the source of powcr and {L heater coil uesociaed with the trnck solenoid in the lust named circuit.

25. In an electric switch operati1ig devce, llie combination of a power line, 2} traclc solenoid,- a normally open circuit connecling the power line with i'ho solenoid, a contactor, a current collector adapted to coopernte with flic contactor to close snid circuit andtemporarily urnish un opemting current to (ho trnck solcnoid, and a second circuit constantly :lurnishing a heating currcnt to flie solenoid.

96. In an electric switch operating device the combinution with the truck eolcnoid and a source of power of connections between lll0 said-two parts temporarily furnisl 1ing un operating cnrrent to the track solenoid and constarily furni,hing a heating currenl thereto,nnd a contaclor and. a current col-i normally open circuit connecting the trolley conductor &nd track solenoid independent of the trolley contactor, i retarded release rcla normally in circuit with the trolley contactor and having two front contacts, one controlling the said n0rmally"open circuit and the other connecting the said relay with the trolley conductor independent of the trolley contacter, {L second retarded relense relay in closed circuit with the trolley conductor at all times, a bock contact for the second mentioned relay cohtrolling a shunt for the firstmentioned relay and a shunt for the second mentioned rclay in circuit With the trolley contactor.

37. In a switch operating system, the cornbination of 'an electrically operated track switch, un operating circuit therefor, a circuit changer for said track switch, :1 norm'lly open switch to control the circuit and t0 shunt out the circuit changer and electrically operated 1nen11s provided with a single operatiug coil to shunt out the nor n1ally open switch alter it has been closed and maintain said means closed whilc current is on the systexn.

38; In 21 switch operating system, the combination ci on electrically operated track switch, et bmnched operuting circuit, a circuit changer for the opereting circuit provided Wth a, positioning coil, a holding coil in one of the branches, a normally open sWitch to control the operating circuit and electrically operated meansprovided with a single operating coil to close the said menus and to maintain it closed to shunt out the norrnally open switch to open the switch and maintain it open after the track switch hus been operated.

SAMUEL S. STOLP. 

